hm, you're right... tried it on my own, modified the PKGBUILD and ended with
$this->bbcode_second_pass_code('', 'Architecture not supported: armv7l')
Maybe there will be some effort on google side on this some day

.
Issue on Github:
https://github.com/pagespeed/ngx_pagespeed/issues/1213Thanks so far

.
- Mathias